Examinando por Materia "Compute Unified Device Architecture (CUDA)"
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Ítem Hardware-accelerated Web Visualization of Vector Fields. Case Study in Oceanic Currents(2012) Aristizábal, Mauricio; Congote, John Edgar; Segura, Álvaro; Moreno, Aitor; Arregui, Harbil; Ruíz, O.Visualization of vector fields plays an important role in research activities nowadays -- Increasing web applications allow a fast, multi-platform and multi-device access to data -- As a result, web applications must be optimized in order to be performed heterogeneously as well as on high-performance as on low capacity devices -- This paper presents a hardware-accelerated scheme for integration-based flow visualization techniques, based on a hierarchical integration procedure which reduces the computational effort of the algorithm from linear to logarithmic, compared to serial integration methodologies -- The contribution relies on the fact that the optimization is only implemented using the graphics application programming interface (API), instead of requiring additional APIs or plug-ins -- This is achieved by using images as data storing elements instead of graphical information matrices -- A case study in oceanic currents is implementedÍtem Real-time depth map generation architecture for 3D videoconferencing(2010) Congote, John; Barandiaran, Iñigo; Barandiaran, Javier; Montserrat, Tomas; Quelen, Julien; Ferran, Christian; Mindan, Pere J.; Mur, Olga; Tarres, Francesc; Ruíz, Óscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEIn this paper we present a reliable depth estimation system which works in real-time with commodity hardware -- The system is specially intended for 3D visualization using autostereoscopic displays -- The core of this work is an implementation of a modifed version of the adaptive support-weight algorithm that includes highly optimized algorithms for GPU, allowing accurate and stable depth map generation -- Our approach overcomes typical problems of live depth estimation systems such as depth noise and ickering -- Proposed approach is integrated within the versatile GStreamer multimedia software platform -- Accurate depth map estimation together with real-time performance make proposed approach suitable for 3D videoconferencingÍtem Realtime dense stereo matching with dynamic programming in CUDA(2009) Congote, John; Barandiaran, Javier; Barandiaran, Iñigo; Ruíz, Óscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEReal-time depth extraction from stereo images is an important process in computer vision -- This paper proposes a new implementation of the dynamic programming algorithm to calculate dense depth maps using the CUDA architecture achieving real-time performance with consumer graphics cards -- We compare the running time of the algorithm against CPU implementation and demonstrate the scalability property of the algorithm by testing it on different graphics cardsÍtem Sistema integrado de generación de mapas de profundidad para videoconferencia 3D en tiempo real(2010) Congote, John; Barandiarán, Iñigo; Barandiarán, Javier; Mindan, Pere J.; Mur, Olga; Aguilar, Genís; Tarrés, Francesc; Montserrat, Tomas; Quelen, Julien; Ferran, Christian; Ruíz, Óscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEThis paper presents the implementation of a high quality real-time 3D video system intended for 3D videoconferencing -- Basically, the system is able to extract depth information from a pair of images coming from a short-baseline camera setup -- The system is based on the use of a variant of the adaptive support-weight algorithm to be applied on GPU-based architectures -- The reason to do it is to get real-time results without compromising accuracy and also to reduce costs by using commodity hardware -- The complete system runs over the GStreamer multimedia software platform to make it even more flexible -- Moreover, an autoestereoscopic display has been used as the end-up terminal for 3D content visualizationÍtem Visualization of flow fields in the web platform(2012) Aristizábal, Mauricio; Congote, John; Segura, Álvaro; Moreno, Aitor; Arregui, Harbil; Ruíz, Óscar; Universidad EAFIT. Departamento de Ingeniería Mecánica; Laboratorio CAD/CAM/CAEVisualization of vector fields plays an important role in research activities nowadays -- Web applications allow a fast, multi-platform and multi-device access to data, which results in the need of optimized applications to be implemented in both high-performance and low-performance devices -- Point trajectory calculation procedures usually perform repeated calculations due to the fact that several points might lie over the same trajectory -- This paper presents a new methodology to calculate point trajectories over highly-dense and uniformly-distributed grid of points in which the trajectories are forced to lie over the points in the grid -- Its advantages rely on a highly parallel computing architecture implementation and in the reduction of the computational effort to calculate the stream paths since unnecessary calculations are avoided, reusing data through iterations -- As case study, the visualization of oceanic currents through in the web platform is presented and analyzed, using WebGL as the parallel computing architecture and the rendering Application Programming Interface